Wire.h i2c slave not working, STM32F103 is freezing..

[gopalreddylakki]

//slave
void requestEvent()
{
  Wire.write("hello\n");  // respond with message of 6 bytes
                          // as expected by master
}

form the Arduino required 15 bytes, in the salve only having 6 bytes. in slave (stm32f103) after sending 6 bytes it's not the end transaction, it's in freezing.

but I check with another board manager stm32duino . it's working fine.

can check it and give me the solution

Slave program (STM32F103)

#include <Wire.h>

#define I2C_ADDR  0x09

void setup()
{
  Wire.begin(I2C_ADDR);         // join i2c bus with address #4
  Wire.onRequest(requestEvent); // register event
  Wire.onReceive(receiveEvent); // register event
  Serial.begin(115200);           // start serial for output
    pinMode(PC13,OUTPUT);
}

void loop()
{
  //empty loop
    digitalWrite(PC13,HIGH);
  delay(200);
  digitalWrite(PC13,LOW);
  delay(200);
}

// function that executes whenever data is received from master
// this function is registered as an event, see setup()
void receiveEvent(int howMany)
{
  while(1 < Wire.available()) // loop through all but the last
  {
    char c = Wire.read();     // receive byte as a character
    Serial.print(c);          // print the character
  }
 // int x = Wire.read();        // receive byte as an integer
  //Serial.println(x);          // print the integer
}

// function that executes whenever data is requested by master
// this function is registered as an event, see setup()
void requestEvent()
{
  Wire.write("hello\n");  // respond with message of 6 bytes
                          // as expected by master
}

master program (ardunio nano )

#include "Wire.h"
#define bl03_address 0x09

void setup()
{
 Wire.begin();
 Serial.begin(115200);
 
 
}
void loop()
{
  //getvoltage();
 //gettemperature();

	
  Wire.beginTransmission(bl03_address);
	Wire.write(0x20);
	Wire.endTransmission();
	Wire.requestFrom(bl03_address,15,true);
	char registerValue = Wire.read();
  char registerValue1 = Wire.read();
	Wire.endTransmission();
  Serial.println(registerValue,HEX);
 Serial.println(registerValue1,HEX);

 delay(500);
}

[gopalreddylakki]

Ardunio_stm32
has Wire_salve.h library with this library STM is working fine without freezing
STM32F1/libraries/WireSlave
check it this library

[fpistm]

Do you have I2C pullup on each i2C line, I've tested the default master/slave examples and it works as expected.

[gopalreddylakki]

Yes added the the pullup on SDA,SCL again sae issuse

Note

for example in my example wire.write ("Hello/n") it means 6byte are sending after that STM is not working

From the master you can try to read more bytes instead of 6 bytes. If you try more than 6 bytes than STM freezes.
Wire.requestFrom(slave_address,50,true);

[fpistm]

Is it a legacy STM32F103?

[gopalreddylakki]

Yes I am using BLUE PILL (STM32F103C)

[fpistm]

This does not mean it is a real STM32, several "bluepill" have a fake STM32.

[gopalreddylakki]

in Our PCB also not working , in BLUE PILL SO ORGINAL ONE

[gopalreddylakki]

any update sir

[fpistm]

No. It works on my side with the default examples master/reader. So hard to help on this.

[gopalreddylakki]

when before sending string, send wire.write(0) then its not freeze

[gopalreddylakki]

As for this write if its successfully send then return 0 , but in the program getting Len of string 6 only

2- is request address
6-is length of string

[fpistm]

As for this write if its successfully send then return 0 , but in the program getting Len of string 6 only

No, it return ret = quantity as expected. 0 is error.

[gopalreddylakki]

if have the board try load this code try to read on i2c more than 6 byte than STM is frizzing can plz check it , less than 6 byte working fine but i am requesting more than 6 byte is freezing

#include <Wire.h>

#define I2C_ADDR 8

TwoWire Wire1(PB11,PB10);
void setup()
{
Wire1.begin(I2C_ADDR); // join i2c bus with address #4
Wire1.onRequest(requestEvent); // register event
Wire1.onReceive(receiveEvent); // register event
Serial.begin(115200); // start serial for output
}

void loop()
{
//empty loop
}

// function that executes whenever data is received from master
// this function is registered as an event, see setup()
void receiveEvent(int howMany)
{
while(1 < Wire1.available()) // loop through all but the last
{
char c = Wire1.read(); // receive byte as a character
Serial.print(c); // print the character
}
int x = Wire1.read(); // receive byte as an integer
Serial.println(x); // print the integer
}

// function that executes whenever data is requested by master
// this function is registered as an event, see setup()
void requestEvent()
{
Serial.println( Wire1.print("hello\n")); // respond with message of 6 bytes
// as expected by master
}

[gopalreddylakki]

Can please check it